/* base.css — reset, non-color custom properties, and base typography.
 *
 * Colors live exclusively in colors.css. Do not add hex values here.
 */

/* ── Non-color custom properties ──────────────────────────────────────────── */
:root {
    /* Typography */
    --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;

    /* Spacing scale */
    --space-1:  0.25rem;
    --space-2:  0.5rem;
    --space-3:  0.75rem;
    --space-4:  1rem;
    --space-5:  1.25rem;
    --space-6:  1.5rem;
    --space-8:  2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Layout */
    --container-max: 1100px;
    --radius:        0.375rem;
    --radius-lg:     0.75rem;
    --radius-pill:   999px;

    /* Nav pill height — used to offset hero min-height */
    --nav-height: 76px;
}

/* ── Reset ────────────────────────────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--color-text-main);
    background-color: var(--color-light);
    -webkit-font-smoothing: antialiased;
}

img, video {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary);
    text-decoration: underline;
}

a:hover {
    color: var(--color-primary-hover);
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* ── Typography ───────────────────────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.25;
    font-weight: 700;
    color: var(--color-text-main);
}

h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.125rem; }

p { margin-bottom: var(--space-4); }
p:last-child { margin-bottom: 0; }

/* ── Utilities ────────────────────────────────────────────────────────────── */
.text-center { text-align: center; }
.text-muted  { color: var(--color-text-muted); }

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn {
    display: inline-block;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    border: 2px solid transparent;
    transition: background-color 0.18s, color 0.18s, border-color 0.18s;
    cursor: pointer;
    line-height: 1.4;
}

.btn-primary {
    background-color: var(--color-cta-primary-bg);
    color: var(--color-cta-primary-text);
    border-color: var(--color-cta-primary-bg);
}
.btn-primary:hover {
    background-color: var(--color-cta-primary-hover-bg);
    border-color: var(--color-cta-primary-hover-bg);
    color: var(--color-cta-primary-text);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.btn-secondary:hover {
    background-color: var(--color-primary-light);
    color: var(--color-primary-hover);
}

.btn-danger {
    background-color: var(--color-error);
    color: var(--color-white);
    border-color: var(--color-error);
}
.btn-danger:hover {
    background-color: var(--color-danger-hover);
    border-color: var(--color-danger-hover);
    color: var(--color-white);
}

.btn-sm {
    padding: var(--space-1) var(--space-3);
    font-size: 0.9375rem;
}

.btn-full {
    width: 100%;
    text-align: center;
}

/* ── Alerts ───────────────────────────────────────────────────────────────── */
.alert {
    padding: var(--space-4);
    border-radius: var(--radius);
    margin-bottom: var(--space-6);
    font-size: 1rem;
}

.alert-success {
    background-color: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid var(--color-success-border);
}

.alert-error {
    background-color: var(--color-error-bg);
    color: var(--color-error);
    border: 1px solid var(--color-error-border);
}

.error-list {
    list-style: disc;
    padding-left: var(--space-6);
    margin-top: var(--space-2);
}

/* ── Forms ────────────────────────────────────────────────────────────────── */
.form-group {
    margin-bottom: var(--space-6);
}

.form-label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--space-2);
    font-size: 1rem;
}

.required {
    color: var(--color-error);
}

.form-input {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background-color: var(--color-white);
    color: var(--color-text-main);
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.form-select {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background-color: var(--color-white);
    color: var(--color-text-main);
    cursor: pointer;
}

.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.form-hint {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    margin-top: var(--space-2);
    margin-bottom: 0;
}

.form-actions {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    padding-top: var(--space-4);
}

/* ── Page transitions ─────────────────────────────────────────────────────── */
@keyframes page-fade-in {
    from { opacity: 0; transform: translateY(10px); }
    to   { opacity: 1; transform: translateY(0); }
}

@keyframes page-fade-out {
    from { opacity: 1; transform: translateY(0); }
    to   { opacity: 0; transform: translateY(-10px); }
}

body {
    animation: page-fade-in 0.3s ease-out both;
}

body.is-leaving {
    animation: page-fade-out 0.22s ease-in both;
    pointer-events: none;
    overflow: hidden;
}

@media (prefers-reduced-motion: reduce) {
    body,
    body.is-leaving {
        animation: none !important;
    }
}